An air conditioner may be provided. The air conditioner may include a housing disposed on a base, the housing may house an evaporator unit, a condenser unit, and a compressor unit. A first air inlet and a first air outlet may be located on a first end of the housing. The first air inlet, the first air outlet and the evaporator may be connected to each other to form an internal air circulation system. A second air inlet and a second air outlet may be located on a second end of the housing. The second air inlet, the second air outlet and the condenser unit may be connected to each other to form an external air circulation system. Airways of the internal air circulation system and the external air circulation system may be independent from each other.

An air conditioner may be provided. The air conditioner may include a housing disposed on a base, the housing may house an evaporator unit, a condenser unit, and a compressor unit. A first air inlet and a first air outlet may be located on a first end of the housing. The first air inlet, the first air outlet and the evaporator may be connected to each other to form an internal air circulation system. A second air inlet and a second air outlet may be located on a second end of the housing. The second air inlet, the second air outlet and the condenser unit may be connected to each other to form an external air circulation system. Airways of the internal air circulation system and the external air circulation system may be independent from each other.

A symmetric pair of mounting brackets for mounting one of a plurality of air filters to a mounting plate of an air conditioner unit are provided. The mounting brackets each define a plurality of mounting surfaces with equidistantly space mounting holes. The mounting surfaces are spaced apart from a plurality of retention surfaces, with the distance between each respective mounting surface and retention surface varying to accommodate a different filter size such that the air conditioner may operate using different filter sizes by simply changing the installation orientation of the mounting brackets.

A booth includes a space surrounded by side walls, an air-conditioner indoor unit that conditions air inside the space, and an air-conditioner outdoor unit to be connected to the air-conditioner indoor unit. The side walls include a first wall on which the indoor unit is disposed, a second wall intersecting and adjoining the first wall, a third wall facing the second wall and on or along which a plurality of heat sources are disposed, and a fourth wall having a door from which a person enters or exits the space. The outdoor unit is disposed on an outer side of the second wall.

A booth includes a space surrounded by side walls, an air-conditioner indoor unit that conditions air inside the space, and an air-conditioner outdoor unit to be connected to the air-conditioner indoor unit. The side walls include a first wall on which the indoor unit is disposed, a second wall intersecting and adjoining the first wall, a third wall facing the second wall and on or along which a plurality of heat sources are disposed, and a fourth wall having a door from which a person enters or exits the space. The outdoor unit is disposed on an outer side of the second wall.

Example embodiments relate to a portable air conditioner including a transport unit. An interior space of the transport unit is adapted to be tempered by the air conditioner and can accommodate the air conditioner for transport. Furthermore, example embodiments relate to a transport unit.

A refrigerator having an air processing apparatus includes: a first cabinet including a storage compartment defining a space in which objects for refrigerating or freezing are stored, and a first door for opening and closing the storage compartment. A second cabinet detachably mounted on one surface of the first cabinet includes an inlet hole and an outlet hole, a blower fan to blow the air drawn into the inlet hole towards the outlet hole, and a filter unit to filter the air drawn into the second cabinet via the inlet hole. A first PCB includes a first control unit implemented to control at least one of a compressor and a pressure regulator of the first cabinet, and a second PCB includes a second control unit implemented to control the blower fan. A first mounting unit is provided at one surface of the first cabinet and defines a predetermined space which can accommodate the first PCB, and a second mounting unit is provided at one surface of the second cabinet and defines a predetermined space which can accommodate both the first PCB and the second PCB.

Method for control of a ventilation heat pump (10), comprising the steps: to measure the pressure drop over an evaporator (KF2) by the use of a pressure transmitter (PV1) during operation of the ventilation heat pump (10) to determine the need for defrosting, and by registering an increased pressure drop by the pressure transmitter (PV1) above a predetermined threshold value, the defrosting sequence is started. The defrosting sequence comprises the steps: stop the compressor (12) of the ventilation heat pump (10), reduce the power level to the exhaust fan (V2) and air supply fan (V1) to a level which is lower than for normal operation, shut the damper (S3) for external air to the evaporator (KF2), shut the damper (Si) for fresh air to the condenser (KF1), and set the damper (S2) for the return air to the evaporator (KF2) to lead return air to the evaporator (KF2), in which, during the defrosting sequence, energy from the return air is used for the defrosting of the evaporator (KF2), and also that circulation of a given volume of recirculated air is maintained.

Method for control of a ventilation heat pump (10), comprising the steps: to measure the pressure drop over an evaporator (KF2) by the use of a pressure transmitter (PV1) during operation of the ventilation heat pump (10) to determine the need for defrosting, and by registering an increased pressure drop by the pressure transmitter (PV1) above a predetermined threshold value, the defrosting sequence is started. The defrosting sequence comprises the steps: stop the compressor (12) of the ventilation heat pump (10), reduce the power level to the exhaust fan (V2) and air supply fan (V1) to a level which is lower than for normal operation, shut the damper (S3) for external air to the evaporator (KF2), shut the damper (Si) for fresh air to the condenser (KF1), and set the damper (S2) for the return air to the evaporator (KF2) to lead return air to the evaporator (KF2), in which, during the defrosting sequence, energy from the return air is used for the defrosting of the evaporator (KF2), and also that circulation of a given volume of recirculated air is maintained.

A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, and a secondary condenser. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a dehumidified airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the primary condenser.